2007/11/30 by E. G. van Putten, E.G. van Putten, Ivo M. Vellekoop +3 · 2 citations
Engineering · Physics and Astronomy · #Acoustics #Advanced Optical Imaging Technologies #Amplitude #Amplitude modulation #Computer science #Electro-optic modulator #Filter (signal processing) #Frequency modulation #Liquid crystal #Liquid-crystal display #Materials science #Modulation (music) #Optical modulator #Optics #Phase (matter) #Phase modulation #Phase noise #Photonic Crystals and Applications #Physics #Pixel #Radio frequency #Random lasers and scattering media #Spatial filter #Spatial frequency #Spatial light modulator #Telecommunications #physics.optics
paper · pdf · doi:10.1364/ao.47.002076
10 pages, 6 figures
arxiv created 2008/02/27 · openalex publication_date 2008/04/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present a method for full spatial phase and amplitude control of a laser beam using a twisted nematic LCD combined with a spatial filter. By spatial filtering we combine four neighboring pixels into one superpixel. At each superpixel we are able to independently modulate the phase and the amplitude of light. We experimentally demonstrate the independent phase and amplitude modulation using this novel technique. Our technique does not impose special requirements on the spatial light modulator and allows precise control of fields even with imperfect modulators.